Changeset 31020

If you set '_wp_page_template' for a post, and then switch to a theme that doesn't support the template, subsequent calls to wp_insert_post() will bail early without running a plethora of hooks. This shouldn't happen. We should set the template to 'default' and continue through the rest of the function. The function will still bail if $wp_error is true via wp_insert_post( $arr, true ).